Starboard Value on Wednesday nominated three directors including its chief executive and founder, Jeff Smith, to Autodesk's board, rekindling its proxy battle with the company over margin concerns. The nominees include Geoff Ribar, former CFO of Cadence Design Systems, and Christie Simons, a senior partner at Deloitte & Touche. Ribar also serves on the board of Acacia Research, a company backed by Starboard, while Simons joined memory chipmaker Micron's board earlier this month. The hedge fund,